Adapter



I J. L. BONANNO AISAPT R Filed June 23, 1927 INVENTOR JOSEPH L. BONANNOKFTORNEY Pucro umo q; sacxzn'a WILNELMS CORP av Patented Jan. 8, 1929. I

uurrso STATES PATENT .IQ'FFICE.

JOSEPH L. BONANNO, OF FOREST HILLS, NEW YORK, ASSIGNOR T RADIO CORPORA-TION' OF AMERICA, n CORPORATION or D'ELAWABE.

ADAPTER.

Application filed June 23, 1927. Serial No. 200,824.

This invention relates to an adapter and more particularly to an adapterfor utiliz-' ing a. tube operated by an alternating current in a'basefor a tube operated by a direct Current. Most receivers at the presenttime make use of direct current tubes, that is, tubes-in which theelectron emitting element is energized or heated by means ofa directcurrent. These tubes are of a well. known type and have the'usual fourprongs leading to the plate, grid and filament of the tube. Recentlythere has been ma'rketedan alternating current tube of the heater typewhich requires five, terminals, one leading to the plate of the tube,one to the grid, one-to the equipotential cathode of the. tube, and twoto the heater element of'the'tube. In order to utilize subhaXtnbe in theordinary receiving set which has a base adapted for the reception. offourvprong tubes, it is an object of my invention to provide anadapter'by means of which the heater type of tube may be readily used insucha set.

In some receiving sets the space between the top of the tube and the lidis very small.

If it is desired to use a different type of tube without changing thetube bases in those sets,

by means of elements inserted between the bases and'the new tubes, itisclear that in many cases, due to the increase in height of the new tubeand element, the lid of the Ieceiving set cannot be closed. Therefore,another object of this invention is to provide an adapter elementwhereby the vertical height taken up by'the new tube-and adapterwill beequal to or less than that taken up by thev old tube and original base.This :3 accomplished by providing'an adapter by meansof which the newtube may be held in position atan angle to that taken by the old tube inits original position.-

My invention shall be more fully described hereinafter by the aid oftheaccompanying drawing in which Fig. 1 is a schematic showing'of theconnections made by my improved adapter;

Fig. 2 is a front view of my adapter; and Fig.- 3 isa sectional view ofmy adapter with a heater type tube inserted therein. Referring to ig. 1numerals l, 2, and 3 indicate tube terminals leading to the grid,equi-potential cathode and. plate of the al ternating current operatedtube die.

grammatically in that figure.- Numerals 4' tube.

The lower portion of Fig. 1 shows the conqnections made within theadapter itself. The: I

four prongs indicated there are adapted as shown in Fig. 3 to beinserted into a' direct equi-potential cathode. Connections 8, and

9 are for connecting the grid socket connection'and the plate socketconnection of the receiver base to the grid and plate respectively ofthealternating current operated tube The heater connectionslO and 111are brought to a convenient point on the adapter as shown in Fig. 2 atscrewft'err'ninals 1.3 and v 75 14. If so desired, additional terminalsmay be placed in series with connector 7 'for'the is well known in theart. a

Fig. 3 shows the adapter and tube in place. 15'indicates the tube cradleor base ofxthe recelving set and 16 shows diagrammatically. the tube.Legs 17 and 18 of the adapter are at right angles to one anotherfor thepurpose of holding the tube horizontally. In this manner no additionalheight is required by the use of my adapter and its use will permit theclosing of the lid of-the receiving of which has five sockets.

2. An adapter for.utilizi'ng a five prong tube in a four prong basehaving two 'pormo tions at substantially right angles to each other, oneof which has four prongs and the other of which has five sockets, saidfive prong tube, when inserted in said portion having five sockets,being held in a horizontal pOsi- 105 \L' non. I

n adapter for utlhzing a five prong in i vhich electron emitting element55 and 5' indicate the heater terminals of that purpose of inserting abiasing potential'as I is energized by an alternating current, in a basehaving four contacts comprising an angled element, one of the legsofsaid angled element having four prongs and the other leg of said elementadapted to support a five prong. tube. a

4. An adapter for utilizing a five prong alternating current tube in abase having four contacts, comprising a right angled element one of theangular legs of said eleihent having four prongs and the other leg ofsaid angled element having five'sockets for supporting a five prongtube.

5. An adapter for ntilizinga five prong alternating current tube, in afour prong base for a direct current tube, comprising a right angledelement one of the legs of said right angled element having four prongsthereon for insertion into a four prong base and a connection thereinfor connecting together two of said prongs.

6. An adapter for utilizing a five prong tube, Whose electron emittingelement is adapted .to be heated by an alternating current, in a foursocket base designed for a tube g JOSEPH L. BONANNO.

